How to Unblock a Basin Without Making the Problem Worse

A slow or blocked basin is usually caused by soap residue, hair, toothpaste and small debris building up around the plug, waste or trap. Start simple and only take parts apart when you are ready to catch water.

Before You Start

• Put towels down under the basin.
• Place a bucket or washing-up bowl under the waste trap.
• Wear gloves, especially if the basin has standing water.
• Do not keep adding chemicals if one product has already failed.

Step 1: Clear The Plug Area

Remove the plug or clicker waste cap if possible. Pull out visible hair and debris, then rinse with hot water. Many minor blockages sit right at the top of the waste.

Step 2: Try A Plunger

Put enough water in the basin to cover the plunger cup. Block the overflow with a damp cloth, then plunge steadily. You want pressure changes, not wild splashing.

Step 3: Flush With Hot Water

If water starts moving, run hot water for a few minutes to carry loosened residue away. Avoid boiling water on delicate fittings or unknown plastic pipework.

Step 4: Remove And Clean The Trap

If the blockage remains, carefully unscrew the trap under the basin with a bucket beneath it. Clean out the trap, check the washers are seated properly, then refit it hand tight. Run water and check for drips.

When To Stop And Call A Professional

• Water backs up into another fixture.
• The blockage returns quickly after cleaning the trap.
• You see leaks from hidden pipework.
• You are not confident refitting the waste trap without leaks.

HIP Toolbox tip: after refitting any waste pipe, dry the area and test with clean tissue. Even a tiny drip is easier to spot before the vanity unit is full again.